[time-nuts] Smart Phone time display accuracy...?

[Jeremy Nichols]

I have that app but don't see an option to display "the offset between 
NTP time and the device's internal clock." Please guide me.

Jeremy


On 3/18/2017 9:37 AM, Glen Hoag wrote:
> On my iPhone, I run an NTP client, Emerald Time, that displays the offset between NTP time and the device's internal clock.
>
> I'm on T-Mobile US and the offset is typically in the low tens of milliseconds or better.
>
> It's certainly accurate enough as a clock where all I'm looking at is one minute resolution.
>
> Glen Hoag
> hoag at hiwaay.net
> Sent from my iPhone
>
>> On Mar 18, 2017, at 09:52, John Hawkinson <jhawk at MIT.EDU> wrote:
>>
>> Chris Albertson <albertson.chris at gmail.com> wrote on Fri, 17 Mar 2017
>> at 14:38:17 -0700 in <CABbxVHsRa41HoB=xu4nk4T_c39uh2BCOMu17Nb7H3rA8uHXLQg at mail.gmail.com>:
>>
>>>> AndroiTS GPS Test (V 1.48 Free) is good, but a battery hog I find.   On
>>> THIS is why the phones don't really track time so well.  Not that they
>>> can't but doing so requires battery power.
>> This statement doesn't seem to be well-supported. I think it's
>> basically untrue if we're talking about timing at the tens of
>> millisecond level.  Anything more precise seems relatively useless in
>> a smartphone without specialized mechanisms to get the time off of the
>> phone.
>>
>> A phone's GPS receiver takes a lot of battery. But GPS is not the primary
>> mechanism that phones use get their time.
>>
>> They get time from the cellular phone network (whether from the layer
>> two timing information or at a higher layer with something like
>> NTP). The effort required to keep a phone's clock in sync, even with a
>> really bad local oscillator, is lost in the noise of all the other
>> things the phone has to do. It's just not a battery issue.
>>
>> The only reason modern smartphones keep bad time is because their
>> designers can't be bothered to do better, or possibly the network is
>> providing "bad" time to the phone. (Unless I'm missing something.)
>>
>> --jhawk at mit.edu
>>   John Hawkinson
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